The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 13, 2006
Filed:
Jul. 31, 2003
Shigeo Shimizu, Yokohama, JP;
Shigeo Shimizu, Yokohama, JP;
Abstract
A liquid-crystal display is driven by pulse-width modulation. One frame of an input video signal is divided into a plurality of subframes. A first pulse signal is applied to a liquid crystal irrespective of the level of the input video signal. A pulse width of the first pulse signal corresponds to the duration of the subframe. Application of the first pulse signal only does not drive the liquid crystal. A second pulse signal is applied to the liquid crystal in accordance with the level of the input video signal so that second pulses of the second pulse signal are superimposed on the first pulses at the same polarity, to perform pulse-width modulation to the liquid crystal. An average duration P of the subframes and a response time L obtained by adding a rise time and a fall time of the liquid crystal meet the requirements P<L and P≦0.15×L.